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A kind of red fluorescent powder and preparation method thereof

A technology for red phosphors and compounds, applied in the field of red phosphors and their preparation, can solve the problems of complex preparation methods and unstable chemical properties of red phosphors, and achieves simple process, high stability of physical and chemical properties, and high color purity. Effect

Active Publication Date: 2015-11-25
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention solves the technical problems of unstable physical and chemical properties and complex preparation methods of the red fluorescent powder existing in the prior art

Method used

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  • A kind of red fluorescent powder and preparation method thereof
  • A kind of red fluorescent powder and preparation method thereof
  • A kind of red fluorescent powder and preparation method thereof

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Embodiment approach

[0015] As a preferred embodiment of the present invention, the chemical formula of the red phosphor is Na 3 (Y 1-x Eu x ) 2 (PO 4 ) 3 , 0.01≤ x ≤0.40.

[0016] The red fluorescent powder provided by the present invention does not contain elements with unstable physical and chemical properties, such as sulfur, so its physical and chemical properties are relatively stable.

[0017] The present invention also provides a preparation method of the red phosphor, comprising mixing and grinding the compound of M, the compound of RE, the compound of Eu and phosphate in proportion, sintering at 1000-1400°C, cooling and grinding to obtain the red phosphor Phosphor powder; wherein, M is one or more of Li, Na or K, and RE is one or more of Y, La or Gd.

[0018] In the preparation method provided by the present invention, the compound of M, the compound of RE, the compound of Eu and phosphate are directly mixed and sintered in proportion by a high-temperature solid-phase method. The ...

Embodiment 1

[0027] Weigh 0.7949gNa 2 CO 3 (analytical pure), 1.7253gNH 4 h 2 PO 4 (analytical pure), 1.0726gY 2 o 3(99.99%) and 0.088gEu 2 o 3 (99.99%) is ground in an agate mortar for 1 hour, taken out and placed in a corundum burning boat, pre-fired in a muffle furnace at 500°C for 5 hours, then heated to 1200°C for 12 hours, cooled naturally Enter in the agate mortar and grind, obtain the red fluorescent powder S1 of the present embodiment, its structural formula is Na 3 (Y 0.95 Eu 0.05 ) 2 (PO 4 ) 3 .

Embodiment 2

[0029] Weigh 1.0365gK 2 CO 3 (analytical pure), 1.6501g (NH 4 ) 2 HPO 4 (analytical pure), 1.4661gLa 2 o 3 (99.99%) and 0.1760gEu 2 o 3 (99.99%) is ground in an agate mortar for 1 hour, taken out and placed in a corundum burning boat, pre-fired in a muffle furnace at 500°C for 5 hours, then heated to 1200°C for 12 hours, cooled naturally Enter in the agate mortar and grind, obtain the red fluorescent powder S2 of the present embodiment, its structural formula is K 3 (La 0.9 Eu 0.1 ) 2 (PO 4 ) 3 .

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Abstract

The invention provides a red fluorescent powder. The chemical formula of the red fluorescent powder is represented by M3(Re1-xEux)2(PO4)3, wherein M comprises one or more of Li, Na and K, Re comprises one or more of Y, La and Gd, x is a molar percentage, and x is not less than 0.01 and not more than 0.40. The invention also provides a preparation method of the red fluorescent powder. The red fluorescent powder provided by the invention has very strong excitation and absorption properties and can emit red light with the wavelength of 619nm in a near-ultraviolet band with the wavelength of 370-410nm, and the color purity of the red light is high. The preparation method of the red fluorescent powder is a high-temperature solid phase method and has a simple technology.

Description

technical field [0001] The invention belongs to the field of light-emitting diodes, in particular to a red fluorescent powder and a preparation method thereof. Background technique [0002] The light source based on semiconductor light-emitting diodes is an all-solid-state light source, which has a long service life, no pollution, high lumen efficiency in the future, fast response speed, flat packaging, and easy thinning and miniaturization. It is called the light source of the 21st century. Light-emitting diodes can be developed to ultraviolet-near ultraviolet at present, with a wavelength of 370-410nm. If the ultraviolet-near-ultraviolet light-emitting diode is mixed with red, green and blue phosphors, an all-solid-state semiconductor lighting device can be obtained. [0003] At present, the commercial red phosphor powder for LED is mainly Y 2 o 2 S:Eu 3+ , the red fluorescent powder is a sulfide, so sulfide is used as a raw material in the preparation process, and it ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/81
Inventor 周芳享
Owner BYD CO LTD
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